Revision stem



FIG. 1 is a front perspective view of an embodiment of a revision stem;

FIG. 2 is a first side elevational view thereof;

FIG. 3 is a second side elevational view thereof;

FIG. 4 is a rear side elevational view thereof;

FIG. 5 is a front side elevational view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

Portions of the figures enclosed in broken lines form no part of the claimed design. 

CLAIM The ornamental design for a revision stem, as shown and described. 